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Algebra: Invertible matrices

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Please show me how would to prove the following matrix:

Let A be a square matrix

a) If B is a square matrix satisfying BA = I, Then B = A^-1

b) If B is a square matrix satisfying AB = I, Then B = A^-1

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Solution Summary

Given that a product of two square matrices is the identity matrix, this solution proves that one is the inverse of the other.

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Let A be a square matrix

a) If B is a square matrix satisfying BA = I, Then B = A^-1

b) If B is a square matrix ...

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